# std::list<T,Allocator>::append_range

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< cpp‎ | container‎ | list

template< container-compatible-range<T> R > void append_range( R&& rg ); |  | (since C++23)

Inserts copies of elements from the range rg before `end()`, in non-reversing order.

No iterators or references are invalidated.

Each iterator in rg is dereferenced exactly once.

### Parameters

rg | - | a container compatible range, that is, an `input_range` whose elements are convertible to `T`
Type requirements
- `T` must be EmplaceConstructible into `list` from *ranges::begin(rg). Otherwise, the behavior is undefined.

### Return value

(none)

### Complexity

Linear in size of rg. The number of calls to the constructor of `T` is exactly equal to the std::ranges::size(rg)).

### Exceptions

If an exception is thrown for any reason, this function has no effect (strong exception safety guarantee).

### Notes

Feature-test macro | Value | Std | Feature
--- | --- | --- | ---
`__cpp_lib_containers_ranges` | `202202L` | (C++23) | Ranges-aware construction and insertion

### Example

Run this code

    #include <cassert>
    #include <list>
    #include <vector>

    int main()
    {
        auto head = std::list{1, 2, 3, 4};
        const auto tail = std::vector{-5, -6, -7};
    #ifdef __cpp_lib_containers_ranges
        head.append_range(tail);
    #else
        head.insert(head.end(), tail.cbegin(), tail.cend());
    #endif
        assert((head == std::list{1, 2, 3, 4, -5, -6, -7}));
    }

### See also

prepend_range (C++23) | adds a range of elements to the beginning (public member function)
insert_range (C++23) | inserts a range of elements (public member function)
push_back | adds an element to the end (public member function)
emplace_back (C++11) | constructs an element in-place at the end (public member function)

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